#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
int ticket = 1000;
pthread_mutex_t mutex;
void *route(void *arg)
{
    char *id = (char *)arg;
    while (1)
    {
        pthread_mutex_lock(&mutex);
        if(ticket>0)
        {
            usleep(1000);
            ticket--;
            printf("%s running, ticket left:%d,id is [%d]\n", id,ticket,pthread_self());
            pthread_mutex_unlock(&mutex);
        }
        else
        {
            pthread_mutex_unlock(&mutex);
            break;
        }

    }
    //return NULL;
}
// void *route(void *arg)
// {
//     char *id = (char *)arg;
//     while (1)
//     {
//         if (ticket > 0)
//         {
//             usleep(1000);
//             printf("%s sells ticket:%d\n", id, ticket);
//             ticket--;
//         }
//         else
//         {
//             break;
//         }
//     }
// }

int main(void)
{
    pthread_t t1, t2, t3, t4;

    pthread_mutex_init(&mutex,NULL); 

    pthread_create(&t1, NULL, route, (void *)"thread 1");
    pthread_create(&t2, NULL, route, (void *)"thread 2");
    pthread_create(&t3, NULL, route, (void *)"thread 3");
    pthread_create(&t4, NULL, route, (void *)"thread 4");

    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    pthread_join(t3, NULL);
    pthread_join(t4, NULL);

    pthread_mutex_destroy(&mutex);
    return 0;
}
